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Fig. S1 Phenotype of the mko2 mutant plants and complementation tests.

Fig. S2 Multiple alignment of an FPGS conserved region close to the catalytic domain.

Fig. S3 Disorganization of the mko2 primary root apical meristem.

Fig. S4 Disorganization in the primary root apical meristem of the atdfb-1 mutant is similar to that of the mko2 mutant.

Fig. S5 Analysis of mko2 root development in the presence of 1-naphthalene acetic acid (NAA).

Fig. S6 Methotrexate-treated wild-type primary roots phenocopy mko2 determinate root growth.

Fig. S7 FPGS1/AtDFB expression pattern in the root.

Fig. S8 Lateral root development in loss-of-function mutants in FPGS1, 2, and 3 genes.

Fig. S9 Bioinformatics analysis of genes co-expressed with FPGS1, 2, and 3 in the root.

Table S1 Genes coexpressed with FPGS1, 2 and 3 in roots in accordance with GENEVESTIGATOR